Pipe threading diestock



March 7, 1959 v H. LANDSMAN 2,499,595

PIPE THREADING DIESTOCK Filed Oct. 1', 1946 INVENTOR.

591217 Zarzdsman BY Patented Mar. 7, 1950 UNITED STAT ES PATENT O FF I CE PIPE THEtEADING .DIESTOCK Henry Landsman, Poughkeepsie, N; Y."

Application-Octobes 1, 1946,.1Serial No.2700,520 1 8 Claims.

This invention relates to a die stock of the typeemploying a fixed' or buttonhead die suchas is commonly used for the threading of pipe.

One ofthe objects ofmyinvention is a die stock :for thetaforementioned purpose which can be used for, threading pipe in .close places or in places --where only a limited protruding end of the. pipe to :be threadedis accessible, or in recessed places where the available working diameter and depthis too limited forthe conventional die-stock to beused.

Anotherobject of the invention is a die stock which willhold a circular pipe die within a cylindrical casing-having no protuberances or projections-at its outersurface, so that the casing may.

For. the attainment of the foregoing and such other objects of invention as may appear or be pointed outherein, I have shown one'embodiment of myinvention in the accompanying drawing, wherein Fig.1 is a side View of the improved die stock;

Fig; 2 is an end view as seen from the forward or pipe-entering-end (right end, Fig. 1);

Fig. 3 is the opposite end View as seen from the rear or driving end (left end, Fig. 1)

Fig. 4 is a side sectional elevation taken on the line 4-4 of Fig. 2; and

Fig. 5 is a cross-sectional View taken on the line 5-5 of Fig. 4.

The improved die stock comprises a cylindrical casing I 0 whose outer surface is of a generally uniform diameter; the casing diameter is of the minimum dimension for receiving the die therein, and the length of the casing is likewise held to a minimum. The cylindrical surface of the casing'is entirely free of any projections or protuberances, so that a pipe in a fixed installation canbe threaded by the improved device even though the space surrounding its end. or through which thepipe end can be reached is extremely limited. It' is. sufiicient that the surrounding space be somewhat larger than the. cylindrical casing III." This ability of the improved die stock to "operate in small round openingsis due not only to the absence of projections -or protuberances or the like on the outer surfaces of the cylindrical'casing and that the diameter thereof is held to the over-all dimension of the die, but

also tothe fact, as will be more fully explained. subsequently, that the improved die stock may.

be turned fromthe-end protrudingfrom the opening.

Casing H] is provided with a central bore which extends throughout its length and is formed of three connecting sections each of different diameter and length andeach serving a different purpose, as will be seen. Bore section II opens at the forward end of the die stock (in which end the pipe is entered), i. e., the right end of casing- IU, Fig. 4, and is of the largest diameter of the three sections. end section I I and is of somewhat smaller diameter, which results in an annular shoulder I4 between bore sections -II and I2. Bore sections II and I2 are cylindrical whereas the third section It is square (but may have any other noncircular outline). Section I3, which opens at the opposite end of casing I0 (left end, Fig. 4) and enters into intermediate section I2, is of considerably smaller cross-section than the two cylin-' drical sections II and I2.

The lengths of the three sections II, 12,13 differ as will beseen in Fig.4. The end section I I is made of a length or depth to accommodate. the: thickness of pipe die 20 and of a sufficiently large diameter to snugly receive the die with one face seated on annular shoulder I6 and the other face substantially flush with the forward or right end, Fig. d, of-the casing. This diameter of end section or die pocket II determines the over-all diameter of casing It; the latter diameter is held to the minimum dimension that will provide a wall I5 of sumcient thickness to permit a tappedhole to be out therethrough. Such tapped hole in casing wall I5 is for set-screw l6 which serves to hold die 2!} against rotation and axial movement. Two such set-screws It are shown spaced 180 apart, althougha different number or holding arrangement may be used.

The intermediate section I2 serves to receive the cuttings or debris resulting from the pipe threading operation. Intermediate section or cuttings chamber I2 is open to the outer surface of cylindrical casing Ii! so that the cuttings or debris may be cleared from the device. Four holes-I7, apart, are shown, see esp. Fig.5, although a different number and spacing may be used. I

u Non-circular section. I3 serves two purposes,=

The next section I2 opens into and it is by reason of both purposes that it is made non-circular in section. And it is also because it serves two purposes that it is considerably longer than the other sections, being in fact about one-half the length of casing 10. One of these functions is to hold a guide pin 30 which enters into the pipe being threaded; the other purpose is to accommodate a driving or turning handle, as will be seen. Guide pin 30, which is tapered 3| at its forward end to facilitate entrance into the pipe or nipple, has an enlarged non-circular butt end 32 which is conveniently shown as square although it may be given any other non-circular section. Accordingly, section I 3 is made square in section and of a dimension to snugly receive butt end 32 of the guide pin. The invention contemplates that the butt end of the guide pin and section [3 be made square in order that it may accommodate the square lug present on the standard driving handle, and of the proper size to receive it.

Butt end 32 of the guide pin is entered into section I3 as shown in Fig. 4 and positioned with its shoulder 33, on the side of the butt from which pin 30 projects, substantially flush with the inner I wall 18 of cuttings chamber i2. Butt end 32 is provided with countersunk cups or depressions 34 on each of its four sides which contact the respective four sides of square bore section [3. Casing I is drilled and tapped for a single set-screw 35, see Fig. 3, which will enter one of the four depressions 34 of the guide pin irrespective of the angular position of butt end 32 relative to the casing, and will hold the guide pin in proper position as described above and shown in Fig. 4. It will be noted that the side (shoulder) 33 of the butt end closes ofi' cuttings chamber [2 so that the debris cannot enter section l3, and that shoulder 33 is substantially fiush with inner wall I8 of the cuttings chamber so that no recess is left in which debris may accumulate. In this connection it will also be observed that the cuttings clearing holes H, see Fig. 4, is positioned so that one edge thereof is only slightly elevated, at 19, above wall l8, so that practically no space is left within which debris will stick.

Butt end 32 occupies only a part of square bore section [3, so that there is sufficient room at the open end of the section, left end of the casing, Fig. 4, for inserting the engaging end or lug of the common type of handles, such as ratchet handles, thus enabling the device to be turned from that end. That end of casing it) may also be provided with a projecting boss 9, shown as hexagonal in Fig. 3, but which may be square or other non-circular shape, for accommodating a wrench, spanner or the like.

Die 26 may be lubricated during the threading operation by introducing a lubricant through a hole 8, see Fig. 2, provided in casing ID at the forward or pipe end, right end, Fig. 4 (i. e., through cylindrical wall l5, Fig. 4). Die itself is provided with a slit 26, Fig. 2, extending from face to face of the die, which registers with hole 8 when the die is properly seated in die pocket I I of casing l0. Instead of a slit, a hole of smaller size than the hole 8, may be provided in the circumference of the die.

I claim:

1. In a die stock of the class described, in combination a circular pipe die, an operating handle having a square connecting lug, a cylindrical casing having a central bore extending for its full length in three sections, the section open at one end of the casing being of somewhat greater diameter than the diameter of the die and of a length somewhat greater than the thickness of the die to serve as a pocket for the die, the intermediate section being of less diameter than that of the die pocket to provide an annular shoulder at the rear of the die pocket and serving as a chamber for the thread cuttings entering the wide central space between the die pocket and cuttings chamber, openings from the outer surface of the cylindrical casing to the interior of the cuttings chamber for discharge of the cuttings therefrom, the third bore section being of square cross-section and size to receive the said lug of the operating handle, a guide pin for inserting into the bore of the pipe being threaded by said die, said guide pin having a butt end of square outline and size to be received in the said third core section, the latter being of sufficient length to accommodate both the said butt end of the guide pin positioned at its end adjacent the cuttings chamber and the said handle lug entered therein at its mouth at the end of the casing.

2. In a die stock of the class described, in combination, a circular pipe die, a cylindrical casing having a central core extending axially in three sections, the section open at one end of the casing being of somewhat greater diameter than the diameter of the die and of a length somewhat greater than the thickness of the die to serve as a pocket for the die, the intermediate section being of less diameter than that of the die pocket to provide an annular shoulder at the rear of the die pocket and serving as a chamber for the thread cuttings entering the wide central space between the die pocket and cuttings chamber, openings from the outer surface of the cylindrical casing to the interior of the cuttings chamber for discharge of the cuttings therefrom, the third bore section being of non-circular cross-section, a guide pin for inserting into the bore of the pipe being threaded by said die, said guide pin having a butt end of the non-circular outline of the said third bore section to be received therein, the outer surface of the cylindrical casing being free of projections or protuberances whereby the casing may be entered into a small circular space surrounding an installed pipe with one end of the casing protruding therefrom, and means at the said protruding end of the casing for turning the die stock.

3. The die stock according to claim 2 wherein the external diameter of the cylindrical casing is only sufficiently larger than the said internal diameter of its said die pocket to provide an annular wall of sufficient thickness to be tapped for a set-screw, whereby the said space into which the casing may be entered is reduced to a minimum.

4. The die stock according to claim 2 wherein the said butt end of the guide pin is positioned at the end of the said third bore section with the face thereof from which the guide pin projects flush with the inner wall of the cuttings chamber and wherein the said openings into the interior of the cuttings chamber is close to the said inner wall thereof, whereby the cuttings chamber is free of recesses wherein the cuttings could accumulate.

5. The die stock according to claim 2 wherein the sides of the butt end of the guide pin contacting the respective sides of the third core section are each provided with a cup depression and the cylindrical casing is drilled and tapped for a single set-screw, whereby the set-screw will enter at its outer surface entering into its said die 10 pocket and the said die is slitted at its circumference to afiord communications with the die threads, the die being positioned in the pocket with its slit aligned with the said casing hole wherethrough a lubricant may be introduced to reach the die threads.

8. The die stock according to claim 2 wherein the said central bore of the casing extends to and is open at the other end of the casing and the said third section thereof is of a non-circular outline and size to receive the lug of an operating handle.

HENRY LANDSMAN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 338,282 Miller Mar. 23, 1886 584,919 Burns June 22, 1897 775,721 Edwins Nov. 22, 1904 1,147,456 Stack July 20, 1915 1,328,279 Graver Jan. 20, 1920 1,863,067 Perry June 14, 1932 

